Oracle RAC cache fusion原理测试(一)

---清理4个节点(54,55,56,57)shared_pool和buffer_cache
现在节点54上清理share pool和data buffer
SQL> alter system flush shared_pool;
系统已更改。
SQL> alter system flush buffer_cache;
系统已更改。

---在其他的节点55,56,57上同样执行

---在第54个节点测试语句
SQL> SELECT COUNT(1)
2 FROM MM_DISTRIBUTION W
3 WHERE W.DATA_AREA LIKE '03'
4 || '%'
5 AND W.CREATE_DATE > TO_DATE('2013-01-01', 'yyyy-mm-dd');
已用时间: 00: 00: 02.40
执行计划
----------------------------------------------------------
Plan hash value: 3507380501
-------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | Pstart| Pstop |
-------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 13 | 5209 (2)| 00:01:03 | | |
| 1 | SORT AGGREGATE | | 1 | 13 | | | | |
| 2 | PARTITION LIST ALL| | 43668 | 554K| 5209 (2)| 00:01:03 | 1 | 2 |
|* 3 | TABLE ACCESS FULL| MM_DISTRIBUTION | 43668 | 554K| 5209 (2)| 00:01:03 | 1 | 2 |
-------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
3 - filter("W"."CREATE_DATE">TO_DATE('2013-01-01 00:00:00', 'yyyy-mm-dd hh24:mi:ss') AND
"W"."DATA_AREA" LIKE '03%')
统计信息
----------------------------------------------------------
2997 recursive calls
0 db block gets
24196 consistent gets
23581 physical reads
0 redo size
334 bytes sent via SQL*Net to client